CN116358199A - Refrigerant recovery method of refrigeration system, refrigeration system and storage medium - Google Patents
Refrigerant recovery method of refrigeration system, refrigeration system and storage medium Download PDFInfo
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- CN116358199A CN116358199A CN202310335290.4A CN202310335290A CN116358199A CN 116358199 A CN116358199 A CN 116358199A CN 202310335290 A CN202310335290 A CN 202310335290A CN 116358199 A CN116358199 A CN 116358199A
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 157
- 238000005057 refrigeration Methods 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000011084 recovery Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 133
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 230000001276 controlling effect Effects 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 41
- 239000007788 liquid Substances 0.000 claims description 24
- 238000010257 thawing Methods 0.000 claims description 22
- 230000005012 migration Effects 0.000 claims description 8
- 238000013508 migration Methods 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 4
- 230000002411 adverse Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 230000002441 reversible effect Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a refrigerant recovery method of a refrigeration system, the refrigeration system and a storage medium, wherein the method comprises the steps of obtaining the current running condition and the running condition of the refrigeration system at the next moment; judging whether the refrigerant needs to be recovered according to the current operation condition and the operation condition at the next moment; if yes, adjusting a valve assembly on the refrigeration system, controlling the refrigeration system to operate in a single cooling mode for a set period of time, and replacing the refrigerant on the surface cooler by the high-temperature refrigerant; and after the set time period, regulating a valve assembly on the refrigeration system, controlling the refrigeration system to operate in a cold and hot water mode, and recovering the refrigerant on the surface cooler. The valve component in the conventional mode in the refrigerating system is regulated, so that the refrigerating system is controlled to safely and efficiently operate, and meanwhile, the refrigerant replaced on the surface cooler and the surface cooler has enough energy, and is easily evaporated into steam to be recycled into the reverse Carnot cycle refrigerating cycle in the cold and hot water mode, thereby preventing adverse effects such as low pressure, difficult oil return, damage to a compressor and the like.
Description
Technical Field
The present invention relates to the field of air conditioning apparatuses, and in particular, to a refrigerant recovery method for a refrigeration system, and a storage medium.
Background
For a total heat recovery heat pump refrigerating system, the commonly used heat exchangers comprise a surface cooler, a hot water heat exchanger and a cold water heat exchanger, three basic operation modes of the refrigerating system can be formed by combining the three heat exchangers in pairs, and the three basic operation modes are as follows: in the single cooling mode, the surface cooler is a condenser, and the cold water heat exchanger is an evaporator; in the single-heat mode, the hot water heat exchanger is a condenser, and the evaporator is a surface cooler; in the cold and hot water mode, the hot water heat exchanger is a condenser, and the cold water heat exchanger is an evaporator.
However, in the cold and hot water mode, when the ambient temperature is low, even if the surface cooler is connected to the air return pipe of the compressor through the four-way valve, the refrigerant still easily migrates to the idle surface cooler; when the outdoor temperature is lower than the saturation temperature corresponding to the suction pressure, the refrigerant steam is still reversely condensed on the inner surface of the surface cooler; when the refrigeration system is converted from the single-mode to the hot-cold water mode, a part of refrigerant is also retained due to the structural characteristics of the surface cooler. According to the above situation, the refrigerant moving or staying in a large amount for a long time can cause serious shortage of the refrigerant running in the cold and hot water mode, so that adverse effects such as low pressure, over-high exhaust, difficult oil return, low energy efficiency and failure of the compressor are caused.
Disclosure of Invention
The invention aims to provide a refrigerant recovery method of a refrigeration system, the refrigeration system and a storage medium, which are used for solving one or more technical problems in the prior art and at least providing a beneficial selection or creation condition.
The invention solves the technical problems as follows: provided are a refrigerant recovery method of a refrigeration system, a refrigeration system and a storage medium.
According to an embodiment of the first aspect of the present invention, there is provided a refrigerant recovery method of a refrigeration system, including:
acquiring the current running condition and the running condition of the refrigerating system at the next moment, wherein the running condition comprises a running mode and running parameters, and the running mode comprises a single cooling mode and a cold and hot water mode;
judging whether the refrigerant needs to be recovered or not according to the current running condition and the running condition at the next moment;
if yes, adjusting a valve component on the refrigeration system, controlling the refrigeration system to operate in a single cooling mode for a set period of time, enabling a high-temperature refrigerant to flow into a surface cooler in the refrigeration system, heating the surface cooler, and replacing the refrigerant on the surface cooler;
and after the set time period, regulating a valve assembly on the refrigeration system, controlling the refrigeration system to operate in a cold and hot water mode, and recovering the refrigerant on the surface cooler.
Further, the judging whether the refrigerant needs to be recovered according to the current operation condition and the operation condition at the next time specifically includes:
the operation mode further comprises a startup mode;
if the current operation mode is the start-up mode and the operation mode at the next moment is the hot and cold water mode, the refrigerant needs to be recovered.
Further, the judging whether the refrigerant needs to be recovered according to the current operation condition and the operation condition at the next time specifically includes:
the operation mode further comprises a single-heat mode, and the operation parameters comprise ambient temperature;
if the current operation mode is a single-heating mode, the operation mode at the next moment is a cold and hot water mode, and the current environment temperature is lower than a set temperature threshold value, the refrigerant needs to be recovered;
the set temperature threshold is a temperature threshold which can automatically recover the refrigerant on the surface cooler.
Further, the judging whether the refrigerant needs to be recovered according to the current running condition and the running condition at the next moment specifically further includes:
the operating parameters further include an operating time of an operating mode;
if the current operation mode and the operation mode at the next moment are both the cold water mode and the hot water mode, and the operation time of the current operation mode exceeds the set migration period and the current ambient temperature is lower than the set temperature threshold, the refrigerant needs to be recovered.
Further, the judging whether the refrigerant needs to be recovered according to the current running condition and the running condition at the next moment specifically further includes:
the operation parameters further comprise saturated steam temperature of the suction side of the compressor, cold water outlet temperature and opening degree of a valve assembly, wherein the opening degree of the valve assembly comprises the opening degree of an expansion valve;
if the current operation mode and the operation mode at the next moment are both cold and hot water modes, the current saturated steam temperature is smaller than the difference value between the current cold water outlet temperature and the set deviation, and the current expansion valve opening reaches the maximum opening, and when the current environment temperature is lower than the set temperature threshold value, the refrigerant needs to be recovered.
Further, the adjusting the valve assembly on the refrigeration system, controlling the refrigeration system to operate in the single cooling mode for a set period of time specifically includes:
the valve assembly comprises a four-way valve, a refrigeration expansion valve, a heating expansion valve and a defrosting valve;
and closing the four-way valve, the heating expansion valve and the defrosting valve, and opening the refrigeration expansion valve and fans on the surface cooler according to the first set opening.
Further, the adjusting the valve assembly on the refrigeration system, controlling the refrigeration system to operate in a cold and hot water mode specifically includes:
and closing fans on the heating expansion valve, the defrosting valve and the surface cooler, opening the four-way valve and opening the refrigeration expansion valve according to a second set opening degree.
Further, the method for recovering the refrigerant further comprises the following steps:
and adjusting an electromagnetic valve on an exhaust pipeline of a compressor in the refrigeration system, and adjusting the electromagnetic valve according to a third set opening, and heating the refrigerant on the surface cooler by utilizing the discharged high-temperature gaseous refrigerant.
According to an embodiment of the second aspect of the present invention, there is provided a refrigeration system, which is applied to the refrigerant recovery method of the refrigeration system according to the embodiment of the first aspect of the present invention, including: the device comprises a hot water heat exchanger, a surface cooler, a cold water heat exchanger, a fan, a four-way valve, a compressor, a gas-liquid separator, a liquid reservoir, a filter, a four-way valve, a refrigeration expansion valve, a heating expansion valve, a defrosting valve, a first one-way valve and a second one-way valve;
the hot water heat exchanger is respectively communicated with an E port of the four-way valve, the liquid storage device and the defrosting valve, the surface air cooler is respectively communicated with a C port of the four-way valve, the second one-way valve and the heating expansion valve, the cold water heat exchanger is respectively communicated with an S port of the four-way valve, the gas-liquid separator and the refrigerating expansion valve, the fan is connected with the surface air cooler, the compressor is respectively communicated with a D port of the four-way valve and the gas-liquid separator, the liquid storage device is respectively communicated with the second one-way valve and the filter through the first one-way valve, and the filter is respectively communicated with the refrigerating expansion valve, the heating expansion valve and the defrosting valve.
According to an embodiment of a third aspect of the embodiments of the present invention, there is provided a computer readable storage medium storing a computer program which, when executed by a processor, implements a refrigerant recovery method of a refrigeration system according to the embodiment of the first aspect.
The beneficial effects of the invention are as follows: judging whether the refrigerating system needs to recover the refrigerant or not through the change of the operation condition of the refrigerating system, when the refrigerating system is under the condition that the refrigerant needs to be recovered, namely, when the migration quantity or retention quantity of the refrigerant is large, the valve assembly in the conventional mode in the refrigerating system is regulated to control the refrigerating system to operate safely and efficiently, and meanwhile, the surface cooler and the replaced refrigerant on the surface cooler have enough energy, and the refrigerant is easily evaporated into steam to be recovered into the reverse Carnot refrigerating cycle in the cold and hot water mode, so that adverse effects such as low pressure, over-high exhaust, difficult oil return, low energy efficiency and failure and shutdown caused by damage to a compressor are prevented.
Drawings
FIG. 1 is a schematic flow chart of a refrigerant recovery method of a refrigeration system according to the present invention;
fig. 2 is a schematic structural diagram of a refrigeration system according to the present invention.
Reference numerals: cold water heat exchanger 100, hot water heat exchanger 200, surface cooler 300, fan 310, refrigeration expansion valve 110, gas-liquid separator 120, compressor 130, four-way valve 140, heating expansion valve 150, reservoir 160, filter 170, defrost valve 180, first check valve 190, second check valve 191.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limiting the invention.
It should be noted that although functional block diagrams are depicted in the system diagrams, in some cases, the steps shown or described may be performed in a different order than the block diagrams or flowchart illustrations in the system. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be determined reasonably by a person skilled in the art in combination with the specific contents of the technical solution.
Taking an air-cooled total heat recovery cold water (heat pump) refrigerating system as an example, the commonly used heat exchangers comprise a surface cooler, a hot water heat exchanger and a cold water heat exchanger, and 3 basic operation modes are formed by combining two by two between 3 heat exchangers, namely the following operation modes: in the single cooling mode, the surface cooler is a condenser, and the cold water heat exchanger is an evaporator; in the single-heat mode, the surface cooler is an evaporator, and the hot water heat exchanger is a condenser; in the cold and hot water mode, the cold water heat exchanger is an evaporator, and the hot water heat exchanger is a condenser.
Because the surface cooler is a heat exchange carrier between the refrigerant and the atmosphere, in the cold and hot water mode, when the ambient temperature is relatively low, the refrigerant is easy to migrate to the idle surface cooler even if the surface cooler is communicated to the muffler of the compressor through the C port and the S port of the four-way valve.
If the outdoor temperature is lower than the saturation temperature corresponding to the suction pressure, the refrigerant steam is still reversely condensed on the inner surface of the surface cooler, and the refrigerant moving in a large quantity for a long time is easy to cause serious shortage of the refrigerant in the cold and hot water mode, so that adverse effects such as low pressure, over-high exhaust, difficult oil return, low energy efficiency and failure and shutdown caused by damage to the compressor are caused.
In addition, in the hot and cold water mode, when the refrigeration system is switched from the single-mode to the hot and cold water mode, a part of refrigerant is retained due to the structural characteristics of the surface cooler, and the adverse effects of the above situations are also caused.
Under the above conditions, experiments and calculations prove that the migrated or retained refrigerant can account for 20-30% of the total refrigerant quantity, and the safety and high-efficiency operation of the refrigeration system can be easily and significantly affected.
Embodiments of the second aspect of the present invention for carrying out embodiments of the first aspect of the present invention, according to embodiments of the second aspect of the present invention, referring to fig. 2, in some embodiments of the present invention, a refrigeration system includes: a hot water heat exchanger 200, a surface cooler 300, a cold water heat exchanger 100, a fan 310, a four-way valve 140, a compressor 130, a gas-liquid separator 120, a liquid reservoir 160, a filter 170, a refrigeration expansion valve 110, a heating expansion valve 150, a defrost valve 180, a first check valve 190, and a second check valve 191.
The hot water heat exchanger 200 is communicated with an E port of the four-way valve 140, the hot water heat exchanger 200 is communicated with one end of the liquid reservoir 160, the other end of the liquid reservoir 160 is communicated with a water inlet of the first one-way valve 190, a water outlet of the first one-way valve 190 is communicated with a water outlet of the second one-way valve 191, a water inlet of the second one-way valve 191 is communicated with the surface cooler 300, the surface cooler 300 is communicated with a C port of the four-way valve 140, and the surface cooler 300 is connected with the fan 310.
The water outlet of the first check valve 190 is communicated with one end of the filter 170, the other end of the filter 170 is communicated with the water inlet of the heating expansion valve 150, the water outlet of the heating expansion valve 150 is communicated with the surface cooler 300, the other end of the filter 170 is communicated with the water inlet of the defrosting valve 180, and the hot water heat exchanger 200 is communicated with the water outlet of the defrosting valve 180.
The other end of the filter 170 is communicated with the cold water heat exchanger 100 through the refrigeration expansion valve 110, the cold water heat exchanger 100 is communicated with the S port of the four-way valve 140, the cold water heat exchanger 100 is communicated with one end of the gas-liquid separator 120, the other end of the gas-liquid separator 120 is communicated with the compressor 130, and the compressor 130 is communicated with the D port of the four-way valve 140.
In this embodiment, the four-way valve 140, the refrigeration expansion valve 110, the heating expansion valve 150, and the defrost valve 180 are all electrically controlled valves.
According to an embodiment of the first aspect of the present invention, referring to fig. 1, in some embodiments of the present invention, a refrigerant recovery method of a refrigeration system specifically includes the following steps:
s100, acquiring the current operation condition and the next operation condition of the refrigeration system, wherein the operation condition comprises an operation mode and operation parameters, and the operation mode comprises a single cooling mode and a cold and hot water mode.
In this embodiment, the current operation of the refrigeration system is confirmed, and the next time the operation of the refrigeration system is confirmed. The operation condition comprises an operation mode and operation parameters, wherein the operation mode comprises the following steps: a start-up mode, a single-hot mode, a single-cold mode and a hot-cold water mode.
That is, the current operation mode and the current operation parameters of the refrigeration system are confirmed, and the current operation mode may be: a start-up mode, a single-hot mode, a single-cold mode and a hot-cold water mode.
Confirming an operation mode of the refrigerating system at the next moment and an operation parameter at the next moment, wherein the operation mode at the next moment can be as follows: a start-up mode, a single-hot mode, a single-cold mode and a hot-cold water mode.
S200, judging whether the refrigerant needs to be recovered according to the current operation condition and the operation condition at the next moment.
In this embodiment, it is confirmed whether or not the refrigerant needs to be recovered based on the current operation condition and the operation condition at the next time obtained in S100. That is, depending on the operation conditions obtained in S100, whether or not the condition for recovering the refrigerant is satisfied.
And S300, if yes, adjusting a valve assembly on the refrigeration system, controlling the refrigeration system to operate in a single cooling mode for a set period of time, enabling the high-temperature refrigerant to flow into a surface cooler in the refrigeration system, heating the surface cooler, and replacing the refrigerant on the surface cooler.
In this embodiment, when it is confirmed that the refrigerant needs to be recovered in S200, the valve assembly on the refrigeration system is adjusted to operate Shan Lengmo mode for a set period of time, so as to replace the low-temperature refrigerant on the surface cooler in the refrigeration system with the high-temperature refrigerant.
That is, when it is confirmed that the refrigerant needs to be recovered, the valve assembly is regulated and controlled through the control program, so that the refrigeration system runs Shan Lengmo, the surface cooler is operated as a condenser, the working process of the condenser is a heat release process, and the condenser is at a higher temperature, thereby realizing heating of the surface cooler and replacing the low-temperature refrigerant on the surface cooler.
The set time period of Shan Lengmo operation is set operation time in a mode of low energy consumption under the condition that normal operation of the refrigerating system is not affected.
And S400, after a set period of time, adjusting a valve assembly on the refrigeration system, controlling the refrigeration system to operate in a cold and hot water mode, and recovering the refrigerant on the surface cooler.
In this embodiment, after the time period set in S300, the valve assembly is regulated and controlled again by the control program, so that the refrigeration system operates in the cold and hot water mode, and the refrigerant on the surface cooler is recovered, so that the refrigeration system operates normally.
That is, after the single cooling mode of the set time period is operated, the valve assembly is regulated and controlled again through the control program, so that the refrigerating system operates in the cold and hot water mode, the cold water heat exchanger is an evaporator, the hot water heat exchanger is a condenser, and the refrigerant on the surface cooler is recovered, so that the unit normally operates.
Judging whether the refrigerating system needs to recover the refrigerant or not through the change of the operation condition of the refrigerating system, when the refrigerating system is under the condition that the refrigerant needs to be recovered, namely, when the migration quantity or retention quantity of the refrigerant is large, the valve assembly in the conventional mode in the refrigerating system is regulated to control the refrigerating system to operate safely and efficiently, and meanwhile, the surface cooler and the replaced refrigerant on the surface cooler have enough energy, and the refrigerant is easily evaporated into steam to be recovered into the reverse Carnot circulation refrigerating cycle in the cold and hot water mode, so that the adverse effects of low pressure, over-high exhaust, difficult oil return, low energy efficiency, failure, shutdown and the like caused by damage to a compressor are prevented.
In some embodiments of the present invention, in S200, the preconditions for recovering the refrigerant specifically include:
s210, if the current operation mode is the start-up mode and the operation mode at the next moment is the cold and hot water mode, the refrigerant needs to be recovered.
In this embodiment, the operating modes include: a start-up mode, a single-hot mode, a single-cold mode and a hot-cold water mode.
If the current operation mode of the operation condition is the starting mode and the operation mode of the operation condition at the next moment is the cold and hot water mode, the refrigerant is confirmed to be required to be recovered. In this embodiment, the startup mode is an operation mode in which the refrigeration system is not operated for a long period of time, and is operated for the first time.
That is, when the refrigeration system is not operated for a long time, is started up for operation for the first time, and is operated in the cold and hot water mode at the next moment, the refrigeration system is operated in the single cold mode for a set period of time, the refrigerant on the surface cooler is heated, the low-temperature refrigerant on the surface cooler is replaced by the high-temperature refrigerant, and after the set period of time, the refrigeration system is operated in the cold and hot water mode, and the refrigerant on the surface cooler is recovered, so that the refrigeration system is operated normally.
When the machine is not started for a long time and is started for the first time, the cold and hot water mode is operated. If the refrigerant migration amount is large, the refrigerant circulation amount of the refrigerating system is insufficient when the cold and hot water mode is directly operated, so that the operation reliability is low, the energy consumption is high, the energy efficiency is low, and the unit can normally operate after the refrigerant is recovered through S300 and S400.
In some embodiments of the present invention, in S200, the preconditions for recovering the refrigerant specifically include:
s220, if the operation mode of the current operation condition is a single-heat mode, the operation mode of the next operation condition is a cold and hot water mode, and the current environment temperature is lower than the set temperature threshold value, the refrigerant needs to be recovered.
In this embodiment, the operating modes include: a start-up mode, a single-hot mode, a single-cold mode and a hot-cold water mode.
If the current operation mode is a single-heating mode and the operation mode of the next operation condition is a cold and hot water mode and the ambient temperature in the operation parameters of the current operation condition is lower than the set temperature threshold, the refrigerant is confirmed to be recovered. In this embodiment, the set temperature threshold is a critical temperature threshold that can automatically recover the refrigerant on the surface air cooler, and the operation parameters include: ambient temperature.
That is, when the single-mode is changed into the hot-cold water mode and the current ambient temperature is lower than a critical temperature threshold value for recovering the refrigerant on the surface cooler without heating, the refrigeration system firstly operates the single-cold mode for a set period of time, heats the refrigerant on the surface cooler, replaces the low-temperature refrigerant on the surface cooler with the high-temperature refrigerant, and after the set period of time, the refrigeration system operates the hot-cold water mode to recover the refrigerant on the surface cooler, so that the refrigeration system operates normally.
When the single-heat mode is changed into the cold and hot water mode, if the refrigerant retention is large, the cold and hot water mode is directly operated, so that the refrigerant circulation quantity of the refrigerating system is insufficient, the operation reliability is low, the energy consumption is high, the energy efficiency is low, and the unit can normally operate after the refrigerant is recovered through S300 and S400.
In some embodiments of the present invention, in S200, the preconditions for recovering the refrigerant specifically include:
s230, if the operation mode of the current operation condition and the operation mode of the next operation condition are both the cold water mode and the hot water mode, and the operation time of the cold water mode and the hot water mode exceeds the set migration period, and the current ambient temperature is lower than the set temperature threshold, the refrigerant needs to be recovered.
In this embodiment, the operating parameters include: ambient temperature and run time of the run mode.
Under the condition that the mode is not switched, the refrigerating system operates in a cold and hot water mode, the operation time of the cold and hot water mode exceeds a set migration period, and when the ambient temperature in the operation parameters of the current operation condition is lower than a set temperature threshold value, the refrigerant is confirmed to be required to be recovered. In this embodiment, the set temperature threshold is a critical temperature threshold that can recover the refrigerant on the surface air cooler without heating.
That is, in the running process of the cold and hot water mode, when the continuous running time of the cold and hot water mode exceeds the set migration period time and the current ambient temperature is lower than a critical temperature threshold value for recovering the refrigerant on the surface cooler without heating, the refrigerating system firstly runs for a set period of time in the single cooling mode, heats the refrigerant on the surface cooler, replaces the low-temperature refrigerant on the surface cooler with the high-temperature refrigerant, and runs the cold and hot water mode after the set period of time, and recovers the refrigerant on the surface cooler, so that the refrigerating system runs normally.
In some embodiments of the present invention, in S200, the preconditions for recovering the refrigerant specifically include:
s240, if the current operation mode and the operation mode at the next moment are both cold and hot water modes, and the current saturated steam temperature is smaller than the difference value between the cold water outlet temperature and the set deviation, and the current expansion valve opening reaches the maximum opening, and when the current environment temperature is lower than the set temperature threshold, the refrigerant needs to be recovered.
In this embodiment, the operating parameters include: the method comprises the steps of ambient temperature, saturated steam temperature at the suction side of a compressor, cold water outlet temperature and opening of a valve assembly, wherein the opening of the valve assembly comprises the opening of an expansion valve.
Under the condition that the mode is not switched, the refrigerating system operates in a cold and hot water mode, and the conditions for recovering the refrigerant are as follows: the saturated steam temperature at the suction side of the compressor is smaller than the difference between the cold water outlet temperature and the set deviation, wherein the set deviation is the deviation between cold water and the evaporation temperature, the refrigerant refers to refrigerant, the cold water refers to secondary refrigerant, and the condition is one of the characteristics of lacking the refrigerant;
the opening of the expansion valve reaches the maximum value in the operation parameters of the current operation condition, wherein in a cold and hot water mode, the heating expansion valve is closed, and the refrigeration expansion valve is opened according to a first set opening;
the ambient temperature in the operation parameters of the current operation condition is lower than a set temperature threshold, wherein the set temperature threshold is a critical temperature threshold for recovering the refrigerant on the surface cooler without heating.
That is, during the cold and hot water mode operation, it is judged whether the following conditions are satisfied:
T 1 <t-ε
P cold ＝maxP cold
T 2 <t τ
wherein T is 1 The saturated steam temperature of the suction side of the compressor is t, the cold water outlet temperature is t, and epsilon is the deviation value of the cold water and the evaporation temperature; p (P) cold Is the opening degree of a refrigeration expansion valve in a cold and hot water mode, maxP cold The maximum opening of the refrigeration expansion valve in the cold and hot water mode; t (T) 2 At ambient temperature t τ Is a critical temperature threshold value for recovering the refrigerant on the surface cooler without heating.
When the conditions are met, the refrigerant on the surface cooler is required to be recovered, the refrigeration system firstly operates in a single-cooling mode for a set period of time, the refrigerant on the surface cooler is heated, the low-temperature refrigerant on the surface cooler is replaced by the high-temperature refrigerant, and after the set period of time, the refrigeration system operates in a hot-cold water mode, and the refrigerant on the surface cooler is recovered, so that the refrigeration system operates normally.
Referring to fig. 2, in some embodiments of the invention, adjusting the valve assembly to operate the refrigeration system in a single cold mode in S300 specifically includes:
s310, closing the four-way valve, the heating expansion valve and the defrosting valve, and opening the refrigerating expansion valve and fans on the surface cooler according to the first set opening.
In this embodiment, the valve assembly comprises: four-way valve, defrosting valve, heating expansion valve and refrigeration expansion valve, wherein, above-mentioned four kinds of valves are automatically controlled valve.
And closing the four-way valve, the refrigeration electronic expansion valve and the defrosting valve, and opening the refrigeration expansion valve and a fan connected with the surface cooler according to a first set opening degree to realize the adjustment of the opening degrees of the refrigeration expansion valve and the fan, so that the refrigeration system operates in a single cooling mode. The first set opening may be a default opening value set according to a current operation condition of the refrigeration system, or may be a default opening value set in advance, in this embodiment, the refrigeration expansion valve and the fan may be adjusted according to the opening set in advance, and after a period of operation, the opening of the refrigeration expansion valve and the opening of the fan may be adjusted according to the exhaust superheat degree or the return superheat degree. When the four-way valve is in a closed state, the port D is communicated with the port C.
Referring to fig. 2, taking the refrigeration system of the second embodiment of the present invention as an example, the four-way valve 140, the refrigeration electronic expansion valve and the defrost valve 180 are closed, the refrigeration expansion valve 110 and the fan 310 connected to the surface cooler 300 are opened at the first set opening, the surface cooler 300 is a condenser, and the cold water heat exchanger 100 is an evaporator.
The refrigerant flows out of the cold water heat exchanger 100, flows into the gas-liquid separator 120, flows into the compressor 130 after gas-liquid separation, is processed by the compressor 130, outputs high-temperature refrigerant, flows into the surface cooler 300 through the D port and the C port which are communicated by the four-way valve 140, the fan 310 on the surface cooler 300 operates, the surface cooler 300 operates as a condenser, the condenser operates as a heat release process, and the condenser has a higher temperature at the moment, so that the surface cooler 300 is heated, and the low-temperature refrigerant on the surface cooler 300 is replaced. The condensed refrigerant flows through the second check valve 191, flows into the filter 170, flows out of the filter 170 to the refrigeration expansion valve 110 for throttling, and finally flows back to the cold water heat exchanger 100 for evaporating and absorbing the heat of cold water to cool, so that the cycle of the single cold mode is completed.
In some embodiments of the present invention, in S400, adjusting the valve assembly to operate the refrigeration system in the hot and cold water mode specifically includes:
s410, closing the heating expansion valve, the defrosting valve and the fans on the surface cooler, and opening the four-way valve and the refrigerating expansion valve according to the second set opening.
In this embodiment, the valve assembly comprises: four-way valve, defrosting valve, heating expansion valve and refrigeration expansion valve, wherein, above-mentioned four kinds of valves are automatically controlled valve.
And closing the heating expansion valve, the defrosting valve and a fan connected with the surface cooler, and opening the refrigeration expansion valve and the four-way valve by a second set opening degree to realize the adjustment of the refrigeration expansion valve and the four-way valve, so that the refrigeration system operates in a cold and hot water mode. The second set opening may be a default opening value set according to a current operation condition of the refrigeration system, or may be a default opening value set in advance, in this embodiment, the refrigeration expansion valve may be adjusted according to the opening set in advance, and after a period of operation, the opening of the refrigeration expansion valve may be adjusted according to the exhaust superheat degree or the return superheat degree. When the four-way valve is in an open state, the D port is communicated with the E port.
Referring to fig. 2, taking the refrigeration system of the second embodiment of the present invention as an example, the heating expansion valve 150, the defrosting valve 180, and the fan 310 connected to the surface cooler 300 are closed, the four-way valve 140 is opened, the refrigeration expansion valve 110 is opened at the second set opening degree, the hot water heat exchanger 200 is a condenser, and the cold water heat exchanger 100 is an evaporator.
The refrigerant flows out of the cold water heat exchanger 100, flows into the gas-liquid separator 120, flows into the compressor 130 after gas-liquid separation, is processed by the compressor 130, outputs high-temperature refrigerant, flows into the hot water heat exchanger 200 for heat exchange processing through a D port and an E port which are communicated by the four-way valve 140, flows out to the liquid reservoir 160, recovers the refrigerant on the surface cooler 300, flows into the filter 170 through the first one-way valve 190, flows out of the filter 170 to the refrigeration expansion valve 110 for throttling, finally flows back to the cold water heat exchanger 100 for heat exchange processing, evaporates and absorbs the heat of cold water to cool, and completes the circulation of a cold water mode and a hot water mode.
In this embodiment, the refrigerating unit operates in a single-heat mode, and the valve assembly is adjusted as follows: closing the refrigerating expansion valve 110 and the defrosting valve 180, opening the heating expansion valve 150 and the blower 310 according to the fourth set opening degree, and opening the four-way valve 140; the refrigeration unit operates in defrost mode with the valve assembly adjusted to: the defrost valve 180 is opened and the four-way valve 140 is in an open state, with the remaining valve components closed.
In some embodiments of the present invention, in S200, the method for recovering the refrigerant further includes:
s250, the high-temperature gaseous refrigerant is discharged into the surface cooler through an exhaust pipeline of a solenoid valve arranged on an exhaust pipeline of the compressor and a third opening degree adjusting solenoid valve, so that the surface cooler and the refrigerant in the surface cooler are heated.
In this embodiment, a solenoid valve is disposed on the compressor discharge line, and the solenoid valve is adjusted according to a third set opening degree, and a branch line of the discharge line that can be controlled is used to heat the surface air cooler and the refrigerant therein by using the high-temperature and high-pressure gaseous refrigerant. Thereby realizing recovery of the refrigerant retained on the surface cooler and enabling the refrigeration system to normally operate.
The method for recovering the refrigerant further comprises the following steps: the special heating device is arranged on the surface cooler so as to realize the function of refrigerant recovery. Compared with the invention, the special heating device has the advantages of high cost and certain energy consumption when the valve is used in the conventional operation mode. The invention mainly relies on the common energy of the surface cooler and the replaced refrigerant to realize the function of recovering the refrigerant, so that the refrigerant can be recovered while the refrigeration system can normally operate, and the energy consumption is greatly reduced.
According to an embodiment of the third aspect of the present invention, a computer readable storage medium stores a computer program, which when executed by a processor implements a refrigerant recovery method of a refrigeration system according to the embodiment of the first aspect.
The non-transitory software program and instructions required to implement the above-described terminal selection method are stored in a memory and when executed by one or more processors, perform a refrigerant recovery method for a refrigeration system according to the first aspect of the present invention.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, parameter structures, program modules or other parameters, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically includes computer readable instructions, parameter structures, program modules, or other parameters in a modulated parameter signal such as a carrier wave or other transport mechanism, and may include any information delivery media.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, and thus do not limit the scope of the claims of the present invention. The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments. In addition, while a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a different order than is shown.
Those skilled in the art will appreciate that many modifications are possible in which the invention is practiced without departing from its scope or spirit, e.g., features of one embodiment can be used with another embodiment to yield yet a further embodiment. Preferred embodiments of the disclosed embodiments are described above with reference to the accompanying drawings, and thus do not limit the scope of the claims of the disclosed embodiments. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the embodiments of the present disclosure shall fall within the scope of the claims of the embodiments of the present disclosure.
Claims (10)
1. A refrigerant recovery method for a refrigeration system, comprising:
acquiring the current running condition and the running condition of the refrigerating system at the next moment, wherein the running condition comprises a running mode and running parameters, and the running mode comprises a single cooling mode and a cold and hot water mode;
judging whether the refrigerant needs to be recovered or not according to the current running condition and the running condition at the next moment;
if yes, adjusting a valve component on the refrigeration system, controlling the refrigeration system to operate in a single cooling mode for a set period of time, enabling a high-temperature refrigerant to flow into a surface cooler in the refrigeration system, heating the surface cooler, and replacing the refrigerant on the surface cooler;
and after the set time period, regulating a valve assembly on the refrigeration system, controlling the refrigeration system to operate in a cold and hot water mode, and recovering the refrigerant on the surface cooler.
2. The refrigerant recovery method of a refrigeration system according to claim 1, wherein the judging whether the refrigerant needs to be recovered according to the current operation condition and the operation condition at the next time comprises:
the operation mode further comprises a startup mode;
if the current operation mode is the start-up mode and the operation mode at the next moment is the hot and cold water mode, the refrigerant needs to be recovered.
3. The refrigerant recovery method of a refrigeration system according to claim 1, wherein the judging whether the refrigerant needs to be recovered according to the current operation condition and the operation condition at the next time comprises:
the operation mode further comprises a single-heat mode, and the operation parameters comprise ambient temperature;
if the current operation mode is a single-heating mode, the operation mode at the next moment is a cold and hot water mode, and the current environment temperature is lower than a set temperature threshold value, the refrigerant needs to be recovered;
the set temperature threshold is a temperature threshold which can automatically recover the refrigerant on the surface cooler.
4. The refrigerant recovery method of a refrigeration system according to claim 3, wherein said determining whether refrigerant recovery is required according to the current operation condition and the operation condition at the next time further comprises:
the operating parameters further include an operating time of an operating mode;
if the current operation mode and the operation mode at the next moment are both the cold water mode and the hot water mode, and the operation time of the current operation mode exceeds the set migration period and the current ambient temperature is lower than the set temperature threshold, the refrigerant needs to be recovered.
5. The refrigerant recovery method of a refrigeration system according to claim 3, wherein said determining whether refrigerant recovery is required according to the current operation condition and the operation condition at the next time further comprises:
the operation parameters further comprise saturated steam temperature of the suction side of the compressor, cold water outlet temperature and opening degree of a valve assembly, wherein the opening degree of the valve assembly comprises the opening degree of an expansion valve;
if the current operation mode and the operation mode at the next moment are both cold and hot water modes, the current saturated steam temperature is smaller than the difference value between the current cold water outlet temperature and the set deviation, and the current expansion valve opening reaches the maximum opening, and when the current environment temperature is lower than the set temperature threshold value, the refrigerant needs to be recovered.
6. The method of claim 1, wherein said adjusting a valve assembly on said refrigeration system, controlling said refrigeration system to operate in a single cooling mode for a set period of time, comprises:
the valve assembly comprises a four-way valve, a refrigeration expansion valve, a heating expansion valve and a defrosting valve;
and closing the four-way valve, the heating expansion valve and the defrosting valve, and opening the refrigeration expansion valve and fans on the surface cooler according to the first set opening.
7. The method of claim 6, wherein said adjusting a valve assembly on said refrigeration system, controlling said refrigeration system to operate in a cold and hot water mode, comprises:
and closing fans on the heating expansion valve, the defrosting valve and the surface cooler, opening the four-way valve and opening the refrigeration expansion valve according to a second set opening degree.
8. The refrigerant recovery method of a refrigeration system according to claim 1, wherein said method for recovering refrigerant further comprises:
and adjusting an electromagnetic valve on an exhaust pipeline of a compressor in the refrigeration system, and adjusting the electromagnetic valve according to a third set opening, and heating the refrigerant on the surface cooler by utilizing the discharged high-temperature gaseous refrigerant.
9. A refrigeration system, characterized by being applied to a refrigerant recovery method of a refrigeration system according to any one of claims 1 to 8, comprising: the device comprises a hot water heat exchanger, a surface cooler, a cold water heat exchanger, a fan, a four-way valve, a compressor, a gas-liquid separator, a liquid reservoir, a filter, a four-way valve, a refrigeration expansion valve, a heating expansion valve, a defrosting valve, a first one-way valve and a second one-way valve;
the hot water heat exchanger is respectively communicated with an E port of the four-way valve, the liquid storage device and the defrosting valve, the surface air cooler is respectively communicated with a C port of the four-way valve, the second one-way valve and the heating expansion valve, the cold water heat exchanger is respectively communicated with an S port of the four-way valve, the gas-liquid separator and the refrigerating expansion valve, the fan is connected with the surface air cooler, the compressor is respectively communicated with a D port of the four-way valve and the gas-liquid separator, the liquid storage device is respectively communicated with the second one-way valve and the filter through the first one-way valve, and the filter is respectively communicated with the refrigerating expansion valve, the heating expansion valve and the defrosting valve.
10. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements a refrigerant recovery method of a refrigeration system according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310335290.4A CN116358199A (en) | 2023-03-30 | 2023-03-30 | Refrigerant recovery method of refrigeration system, refrigeration system and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310335290.4A CN116358199A (en) | 2023-03-30 | 2023-03-30 | Refrigerant recovery method of refrigeration system, refrigeration system and storage medium |
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| CN202310335290.4A Pending CN116358199A (en) | 2023-03-30 | 2023-03-30 | Refrigerant recovery method of refrigeration system, refrigeration system and storage medium |
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| CN (1) | CN116358199A (en) |
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